Check if OrderedDictionary collection is read-only in C#

To check if OrderedDictionary collection is read-only, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main(){
      OrderedDictionary dict = new OrderedDictionary();
      dict.Add("1", "One");
      dict.Add("2", "Two");
      dict.Add("3", "Three");
      dict.Add("4", "Four");
      dict.Add("5", "Five");
      dict.Add("6", "Six");
      dict.Add("7", "Seven");
      dict.Add("8", "Eight");
      ICollection col = dict.Values;
      String[] strVal = new String[dict.Count];
      col.CopyTo(strVal, 0);
      Console.WriteLine("Displaying the values...");
      for (int i = 0; i < dict.Count; i++) {
         Console.WriteLine(strVal[i]);
      }
      Console.WriteLine("If OrderedDictionary read-only? = "+dict.IsReadOnly);
      Console.WriteLine("The OrderedDictionary has the key 15? = "+dict.Contains("15"));
      Console.WriteLine("The OrderedDictionary has the key 5? = "+dict.Contains("5"));
   }
}

Output

This will produce the following output −

Displaying the values...
One
Two
Three
Four
Five
Six
Seven
Eight
If OrderedDictionary read-only? = False The OrderedDictionary has the key 15? = False
The OrderedDictionary has the key 5? = True

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main(){
      OrderedDictionary dict = new OrderedDictionary();
      dict.Add("A", "Pen");
      dict.Add("B", "Pencil");
      dict.Add("C", "Notebook");
      dict.Add("D", "Table");
      dict.Add("E", "Chair");
      dict.Add("F", "Coworking");
      dict.Add("G", "Cubicle");
      dict.Add("H", "Sticky Notes");
      dict.Add("I", "WhiteBoard");
      dict.Add("J", "Marker");
      ICollection col = dict.Values;
      String[] strVal = new String[dict.Count];
      col.CopyTo(strVal, 0);
      Console.WriteLine("Displaying the values...");
      for (int i = 0; i < dict.Count; i++) {
         Console.WriteLine(strVal[i]);
      }
      Console.WriteLine("If OrderedDictionary read-only? = "+dict.IsReadOnly);
      Console.WriteLine("The OrderedDictionary has the key B? = "+dict.Contains("B"));
   }
}

Output

This will produce the following output −

Displaying the values...
Pen
Pencil
Notebook
Table
Chair
Coworking
Cubicle
Sticky Notes
WhiteBoard
Marker
If OrderedDictionary read-only? = False The OrderedDictionary has the key B? = True